BibTex format
@article{Aaij:2026:10.1007/JHEP04(2026)170,
author = {Aaij, R and Abdelmotteleb, ASW and Abellan, Beteta C and Abudinén, F and Ackernley, T and Adefisoye, AA and Adeva, B and Adinolfi, M and Adlarson, P and Agapopoulou, C and Aidala, CA and Ajaltouni, Z and Akar, S and Akiba, K and Akthar, M and Albicocco, P and Albrecht, J and Aleksiejunas, R and Alessio, F and Alvarez, Cartelle P and Amalric, R and Amato, S and Amey, JL and Amhis, Y and An, L and Anderlini, L and Andersson, M and Andreola, P and Andreotti, M and Andres, Estrada S and Anelli, A and Ao, D and Arata, C and Archilli, F and Areg, Z and Argenton, M and Arguedas, Cuendis S and Arnone, L and Artamonov, A and Artuso, M and Aslanides, E and Ataíde, Da Silva R and Atzeni, M and Audurier, B and Authier, JA and Bacher, D and Bachiller, Perea I and Bachmann, S and Bachmayer, M and Back, JJ and Baladron, Rodriguez P and Balagura, V and Balboni, A and Baldini, W and Baldwin, Z and Balzani, L and Bao, H and Baptista, de Souza Leite J and Barbero, Pretel C and Barbetti, M and Barbosa, IR},
doi = {10.1007/JHEP04(2026)170},
journal = {Journal of High Energy Physics},
title = {Differential decay rate of B+→ J/ψK+ with the LHCb Upgrade I experiment},
url = {http://dx.doi.org/10.1007/JHEP04(2026)170},
volume = {2026},
year = {2026}
}
RIS format (EndNote, RefMan)
TY - JOUR
AB - The normalised decay rate of B<sup>+</sup> → J/ψ(→ μ<sup>+</sup>μ<sup>−</sup>)K<sup>+</sup> is measured as a function of the lepton helicity angle using a data sample corresponding to an integrated luminosity of 1.1 fb<sup>−1</sup> collected during October 2024 with the upgraded (Upgrade I) LHCb detector. This angular distribution can be parameterised by two coefficients, the forward-backward asymmetry, A<inf>FB</inf>, and the flatness parameter, F<inf>H</inf>, whose values are constrained by conservation of angular momentum. These coefficients are measured both integrated and differentially across various kinematic and detector-response variables, and the results are found to be in good agreement with expectations. These measurements show that the detector response of the LHCb Upgrade I experiment is understood to the precision required to reliably extract the angular coefficients associated with rare b → sμ<sup>+</sup>μ<sup>−</sup> and b → dμ<sup>+</sup>μ<sup>−</sup> transitions, which are particularly sensitive to physics beyond the Standard Model.
AU - Aaij,R
AU - Abdelmotteleb,ASW
AU - Abellan,Beteta C
AU - Abudinén,F
AU - Ackernley,T
AU - Adefisoye,AA
AU - Adeva,B
AU - Adinolfi,M
AU - Adlarson,P
AU - Agapopoulou,C
AU - Aidala,CA
AU - Ajaltouni,Z
AU - Akar,S
AU - Akiba,K
AU - Akthar,M
AU - Albicocco,P
AU - Albrecht,J
AU - Aleksiejunas,R
AU - Alessio,F
AU - Alvarez,Cartelle P
AU - Amalric,R
AU - Amato,S
AU - Amey,JL
AU - Amhis,Y
AU - An,L
AU - Anderlini,L
AU - Andersson,M
AU - Andreola,P
AU - Andreotti,M
AU - Andres,Estrada S
AU - Anelli,A
AU - Ao,D
AU - Arata,C
AU - Archilli,F
AU - Areg,Z
AU - Argenton,M
AU - Arguedas,Cuendis S
AU - Arnone,L
AU - Artamonov,A
AU - Artuso,M
AU - Aslanides,E
AU - Ataíde,Da Silva R
AU - Atzeni,M
AU - Audurier,B
AU - Authier,JA
AU - Bacher,D
AU - Bachiller,Perea I
AU - Bachmann,S
AU - Bachmayer,M
AU - Back,JJ
AU - Baladron,Rodriguez P
AU - Balagura,V
AU - Balboni,A
AU - Baldini,W
AU - Baldwin,Z
AU - Balzani,L
AU - Bao,H
AU - Baptista,de Souza Leite J
AU - Barbero,Pretel C
AU - Barbetti,M
AU - Barbosa,IR
AU - Barlow,RJ
AU - Barnyakov,M
AU - Barsuk,S
AU - Barter,W
AU - Bartz,J
AU - Bashir,S
AU - Batsukh,B
AU - Battista,PB
AU - Bay,A
AU - Beck,A
AU - Becker,M
AU - Bedeschi,F
AU - Bediaga,IB
AU - Behling,NA
AU - Belin,S
AU - Bellavista,A
AU - Belous,K
AU - Belov,I
AU - Belyaev,I
AU - Ben-Haim,E
AU - Benane,G
AU - Bencivenni,G
AU - Berezhnoy,A
AU - Bernet,R
AU - Bernet,Andres S
AU - Bertolin,A
AU - Betti,F
AU - Bex,J
AU - Bezshyyko,O
AU - Bhattacharya,S
AU - Bhom,J
AU - Bieker,MS
AU - Biesuz,NV
AU - Biolchini,A
AU - Birch,M
AU - Bishop,FCR
AU - Bitadze,A
AU - Bizzeti,A
AU - Blake,T
DO - 10.1007/JHEP04(2026)170
PY - 2026///
TI - Differential decay rate of B+→ J/ψK+ with the LHCb Upgrade I experiment
T2 - Journal of High Energy Physics
UR - http://dx.doi.org/10.1007/JHEP04(2026)170
VL - 2026
ER -